Presidential Faculty Fellow

主要研究微波与毫米波固态器件的准光功率组合。该技术允许将大量单个设备的功率组合在一个紧凑、低成本、可靠的高功率源中。由于功率组合发生在自由空间，因此需要考虑辐射和天线的设计。利用场效应管或双极晶体管对放大器和振荡器合成器进行了研究。针对不同的设计标准，如功率、带宽、效率或低噪声，开发了面向设计的辐射结构几何优化分析。在振荡器的情况下，研究了大量器件的非线性行为和注入锁定。在放大器的情况下，高效率的电路拓扑结构与辐射结构相结合，以尽量减少散热要求。这项工作的目标是开发一种紧凑、廉价的微波固态源，用于各种应用，如车载雷达、移动通信、无线通信、大气研究和遥感。＊＊＊

9350206 Popovic The research concentrates on quasi optical power combining of microwave and millimeter wave solid state devices. This technique allows the powers of a large number of individual devices to be combined in a compact, low cost, reliable high power source. Since the power combining occurs in free space, radiation and antenna design are addressed. Both amplifier and oscillator combiners are studied, using FETs or bipolar transistors. A design oriented analysis is developed for optimizing the radiating structure geometry towards different design criteria, such as power, bandwidth, efficiency or low noise. In the case of oscillators, nonlinear behaviour and injection locking of a large number of devices are studied. In the case of amplifiers, a high efficiency circuit topology is combined with the radiating structure in order to minimize heat sinking requirements. The goal of the work is to develop a compact, inexpensive microwave solid state source for a variety of applications, such as vehicular radar, mobile communications, wireless communications, atmospheric studies and remote sensing. ***